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Table 3 Cox proportional HRs for non-accidental mortalitya in the cohort, with stepwise addition of covariates

From: Risk estimates of mortality attributed to low concentrations of ambient fine particulate matter in the Canadian community health survey cohort

  

95 % CI

 
 

HRb

Lower

Upper

(−2) log l

Unadjusted

1.028

0.981

1.077

447,246

SES covariates added separately

    

  Immigrant status

*1.069

1.019

1.120

447,165

  Visible minority status

1.031

0.984

1.080

447,237

  Aboriginal status

1.035

0.988

1.085

447,217

  Marital status

0.999

0.954

1.047

446,677

  Educational attainment

*1.114

1.063

1.168

446,442

  Income adequacy quintiles

1.031

0.985

1.081

446,127

  Employment

1.032

0.985

1.081

445,050

All socioeconomic covariates

*1.103

1.052

1.157

443,829

All SES + ecological covariates added separately

    

% recent immigrants

*1.253

1.190

1.320

440,157

  % completed high school

*1.349

1.278

1.424

437,545

  % low income

1.045

0.994

1.099

433,397

All SES + all ecological covariates

*1.345

1.270

1.424

433,080

All SES + all ecological + behavioural covariates added separately

    

  Smoking

*1.341

1.267

1.420

431,304

  Alcohol consumption

*1.292

1.221

1.368

432,308

  Fruit and vegetable consumption

*1.342

1.267

1.421

433,004

  Body Mass Index

*1.345

1.270

1.424

432,338

All SES + all ecological + all behavioural covariates

*1.261

1.190

1.336

429,524

  1. aNumber of deaths = 26,300
  2. bModels are stratified by age (5 year categories) and sex
  3. *Significant HR (p < 0.05)
  4. SES Socioeconomic